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Use simpara according to new style guide
Fix indentation
Use semantic line breaks and reduce line length to 80 chars were reasonable as dictated by our style guide

language/oop5/abstract.xml

@@ -21,19 +21,19 @@
    <link linkend="language.oop.lsp">signature compatibility</link> rules.
   </para>
 
-  <para>
+  <simpara>
    As of PHP 8.4, an abstract class may declare an abstract property, either public or protected.
    A protected abstract property may be satisfied by a property that is readable/writeable from either
    protected or public scope.
-  </para>
-  <para>
+  </simpara>
+  <simpara>
    An abstract property may be satisfied either by a standard property or by a property
    with defined <link linkend="language.oop5.property-hooks">hooks</link>, corresponding to the required operation.
-  </para>
+  </simpara>
 
   <example>
    <title>Abstract method example</title>
-    <programlisting role="php">
+   <programlisting role="php">
 <![CDATA[
 <?php
 abstract class AbstractClass
@@ -171,10 +171,10 @@ class C extends A
 ]]>
    </programlisting>
   </example>
-  <para>
+  <simpara>
    An abstract property on an abstract class may provide implementations for any hook,
    but must have either <literal>get</literal> or <literal>set</literal> declared but not defined (as in the example above).
-  </para>
+  </simpara>
   <example>
    <title>Abstract property example</title>
    <programlisting role="php">

language/oop5/interfaces.xml

@@ -91,17 +91,21 @@
   </sect2>
   <sect2 xml:id="language.oop5.interfaces.properties">
    <title>Properties</title>
-   <para>
-    As of PHP 8.4.0, interfaces may also declare properties.  If they do, the declaration must specify if the
-    property is to be readable, writeable, or both.  The interface declaration applies only to public read
-    and write access.
-   </para>
-   <para>
-    An class may satisfy an interface property in multiple ways.  It may define a public property.  It may
-    define a public <link linkend="language.oop5.property-hooks.virtual">virtual property</link> that implements
-    only the corresponding hook.  Or a read property may be satisfied by a <literal>readonly</literal> property.
+   <simpara>
+    As of PHP 8.4.0, interfaces may also declare properties.
+    If they do, the declaration must specify if the property is to be readable,
+    writeable, or both.
+    The interface declaration applies only to public read and write access.
+   </simpara>
+   <simpara>
+    An class may satisfy an interface property in multiple ways.
+    It may define a public property.
+    It may define a public
+    <link linkend="language.oop5.property-hooks.virtual">virtual property</link>
+    that implements only the corresponding hook.
+    Or a read property may be satisfied by a <literal>readonly</literal> property.
     However, an interface property that is settable may not be <literal>readonly</literal>.
-   </para>
+   </simpara>
    <example>
     <title>Interface properties example</title>
     <programlisting role="php">